Bergh



(No Model.)

H. G. BRILL.

SCREW CUTTING MAGHINE.

No. 434,913. Patented Aug. 26, 1890.

g/TNESSES IIVVZ/VTOR Attorney id/I'M UNITED STATES PATENT OFFICE.

HENRY G. BRILL, OF READING, PENNSYLVANIA, ASSIGNOR TO J. H. STERN- BERGH & SON, OF SAME PLACE.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 434,913, dated August 26, 1890.

Application filed November 8. 1889. Serial No; 329,636. (No model.)

To all whom it may concern:

Be it known that I, HENRY O. BRILL, a citizen of the United States, residing at Reading,in the county of Berks, State of Pennsylvania, have invented certain Improvements in Screw-Gutting Machines, of which the following is a specification.

This invention relates to screw-cutting machines having cutters adapted to be opened and closed by means of a sleeve upon the machine-spindle. Among the means heretofore adapted to open and close such cutterspivoted levers have been employed, opposite ends of which engaged the cutter-holders, and a conical sleeve sliding upon the spindle, whereby the cutters were opened and closed simultaneously to release a threaded bolt or operate upon a new blank. 7

The chief object of myinvention is to comc bine with the opening and closing mechanism a simple and reliable means of varying A the extent to which the cutters are closed; and

to that end it consists, mainly, in the application of an operating-sleeve having two independent movements,one of which is adapted to change the size of the cut and the other to release or clasp the work.

The features of the invention are fully set forth herein in connection with the accompanying drawings, and are specifically pointed out in the claims.

Figure 1 is a longitudinal elevation, partly in section, of a portion of a screw-cutting machine involving my invention. Flg. 2 is a front view of the same. Fig. 3 is a separate view of the rotary sleeve. Fig. 4 is a section through Fig. 1, showing the main portion. only of the operating-sleeve. Fig. 5 shows an equivalent form of operating-sleeve.

The die-stock or head A, which is secured to the screw-threaded end ofthe spindle B, is provided with radial grooves in its front face adapted to receive cutter-holders 0, carrying cutters C. A front plate L, secured to the head by screws L, serves to retain the holders in position, though the latter are adjustable radially by means of levers D, pivoted intermediately to the head and having front ends D engaging the holders while the rear ends D bear upon the operating-sleeve.

This sleeve, as illustrated in Fig. 1, is made up of a main portion E, formed with a circular groove E, which is engaged by a yoke M, secured to a rod N of the machine. The movement of this yoke slides the sleeve longitudinally upon the spindle B, with which it is rotated by means of the feather B The reduced forward end E of this main portion of the operating-sleeve is screw-threaded to receive a conical collar G, which when screwed upon said end B serves to secure in place a secondary sleeve F in such a manner as to permit a rotary movement of the latter on the main sleeve. The periphery of this rotary sleeve is formed with a series of circular inclines F, the same in number as the levers D, and it is slightly beveled so as to form a continuation of the collar G, in connection with which it thus forms the conical front of the operating-sleeve.

Under the forward end of the pivoted levers D, near the connection with the cutter holders, are springs H, which tend to lift said levers and thusopen the cutters, and on the opposite side of the pivotal point A are provided springs K, which tend to depress the rear end of the lever and co-operate with the forward springs H in opening the cutters. The rear springs are readily accessible and their pressure can be varied by suitable 8o means, as set-screw A The objects of this construction are, first, to reduce the wear and friction upon the pivots A which is accomplished by pressing upon both ends of the lever instead of one; and, second, to avoid unnecessary pressure of the ends D upon the cone, the pressure of the spring K being decreased for lightwork and increased for heavier work to an amountsufficient to withdraw the cutters. v

In operating my machine the cutters G are in the first place adjustable in their holders in the ordinary manner by means of setscrews 0 Then the cone E isin a forward position, as shown in Fig. 1, the holders are closed to a working position, but when it is thrown backward automaticallyor otherwise the springs H and K co-operate to open the cutters, the necessary pressure being provided, as just described, by means of setscrews A In case the cutters should be worn slightly, thus requiring a slight closing in orderto cut to the proper size, or if it is desired to cut a larger or smaller thread, for which the same cutters are suited, it is only necessary to turn the rotary sleeve F, thus raising or lowering the ends D of the levers, which ride up or down the circular inclines F as far as desired, and againv fasten it by means of a set-screw F The length of the conical front of the operating-sleeve, up which the ends D of the levers are made to ride before they reach the top of the incline, and consequently the point to which they are raised and the cutters closed, may'thus be regulated to the greatest nicety. A scale E may be advantageouslyused to facilitate the change from one size of cut to another.

Fig. 5 shows a modification of the sleeve construction, in'which the conical and circular inclines are formed in one piece P, which is capable of rotary motion on a sleeve R, feathered on the spindle, to which sleeve it may be adjustably secured by means of a setscrew P. This and other modifications of my invention may be readily devised, and I do not therefore limit myself to the construction herein set forth; but

What I claim is- 1. In a die-stock or head, the combination, with adjustable cutter-holders, of a conical operating-sleeve formed with peripheral projections and having both a rotary and axial movement and a connecting mechanism engaging both the cutters and said sleeve, substantially as described, whereby said cutters may be operated independently by either the rotary or axial movement of the sleeve, substantially as set forth.

2. A die-stock or head having adjustable cutter-holders, pivoted levers having ends engaging said holders, and a conical operating-sleeve engaging the opposite ends of said levers and formed with a series of circular inclines F, all arranged and adapted to operate substantially as setforth.

3. In a die-stock or head, the combination, with the adjustable cutter-holders and pivoted levers having ends engaging said holders, of an operating-sleeve consisting of a main portion having an axial movement, a rotary sleeve formed with circular inclines F mounted on said main portion, and a removable collar G, forming therewith the conical front of the operating-sleeve, substantially as set forth. 4. In a die-stock or head, the combination, with adjustable cutter-holders and an operating-sleeve, substantially as described, of pivoted levers having opposite ends engaging said holders and sleeve, and fixed springs H and adjustable springs K, operating onopposite ends of said levers to open said dies, all substantially as and for the purpose set forth. In testimony whereof I affix my signature in presence of two witnesses.

HENRY O. BRILL. Witnesses:

1 1-1. STERNBERGH, H. M. M. RICHARDS. 

